Drum winder for paper and the like



Feb. 22, 1966 HORNBOSTEL 3,235,471

DRUM WINDER FOR PAPER AND THE LIKE Filed Dec. 2, 1963 Fig.1

/6 INVENTOR.

United States Patent 3,236,471 DRUM WIN DER FOR PAPER AND THE LIKE Lloyd Hornbostel, Beloit, Wis., assignor to Beloit Corporation, Beloit, Wis., a corporation of Wisconsin Filed Dec. 2, 1963, Ser. No. 327,310 4 Claims. (Cl. 24266) This invention relates to improvements in drum winders for paper and the like and more particularly relates to an improved form of control means for controlling the density of the roll of paper.

In winding large diameter rolls of paper, in which the roll of paper is placed on power driven winding drums and rotatably driven thereby in a winding direction, as the web material is wound about its winder shaft, the wound roll increases in hardness, as the diameter and weight of the roll increases, with a resultant non-uniform density of the rewound roll of paper.

The density of the roll of paper has heretofore been controlled by the use of a rider roll bearing on the top of the roll of paper, and by applying lifting forces to opposite ends of the winder shaft to remove some of the weight of the roll of paper from the nips between the roll of paper and the winding drums.

The winder shafts, however, are quite flexible and deflect considerably under the lifting force with the resultant non-uniform removal of weight from the nip between the roll of paper and the winding drums, in the across-the-machine direction, and many times the Winder shafts are not strong enough to allow suflicient relieving force to be applied to them to properly control the roll densityv In carrying out the present invention, I relieve the nip pressures between the roll and the winding drums by applying a lifting force to the opposite ends of the winder shaft and by subjecting the winder shaft to an oppositely directed cantilever bending action.

This cantilever bending action counteracts the deflection of the winder shaft, which under the lifting forces assumes a U-shaped deflection and exerts a counteraction on the winder shaft, to assume an S-shaped deflection curve and more nearly approach a straight line, and thereby more uniformly relieves the weight from the roll of paper and effects a uniform density of the roll.

The S-shaped deflection more nearly approaches a straight line giving a more uniform relieving of weight from the roll of paper and the journals for the winder shaft and those portions of the shaft between the face or side of the roll, and the journal supports for the bearing boxes are stressed less by this counterbending than by a simple relieving action by lifting on opposite ends of the shaft, because of the reversal of bending and the area between the face of the roll and the journal supports, with the resultant lower stresses in the journal supports, making it possible to increase the load relieving action over what could practically be attained by simply lifting on opposite ends of the winder shaft.

The relieving of weight from the roll as it builds up, and the pressure of bending also increases as it builds up as a straight line function of diameter so the relieving forces on opposite ends of the winder shaft are equal to the total relieving force output minus the bending forces, and where the system is operated by fluid under pressure, it may be operated by the same valve supplying fluid ICC under pressure to both the bending and the relieving cylinders, or the ratio of the pressures may be changed to adjust the amount of bending consistent with the amount of relieving.

A principal object of the present invention, therefore, is to overcome the deficiencies heretofore present in drum type winders and to effect the winding of a soft roll by providing relieving forces at opposite ends of the winder shaft for the roll, and by offsetting the deflection of the shaft caused by these relieving forces and subjecting the winder shaft to bending actions about its ends.

Another object of the invention is to improve upon the drum winders heretofore in use for winding large diameter rolls of paper having a winder shaft extending through the roll of paper, by relieving the weight of the roll of paper on its supporting winding drums by lifting opposite ends of the winder shaft and by placing a bending action on the shaft in a direction contrary to the lifting action on opposite ends of the shaft.

A still further object of the invention is to provide an improved system for controlling the load supported by a pair of winder drums of a drum web winder, while the roll is continuously building up on the winder shaft, which comprises fluid pressure operated devices exerting a lifting action on opposite ends of the shaft and other fluid pressure devices exerting a contrary bending action on opposite ends of the shaft, in which the lifting and bending forces progressively increase upon building up of the roll.

A still further object of the invention is to provide an improved form of winder having a pair of winder drums supporting a web roll, continuously building up on a winder shaft, by lifting opposite ends of the shaft by fluid pressure cylinders and pistons, in which the forces of lifting are counteracted by other fluid pressure cylinders and pistons exerting bending actions on opposite ends of the shaft contra to the deflection action exerted on the shaft by the lifting cylinders and pistons.

These and other objects of the invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings wherein:

FIGURE 1 is a diagrammatic front elevational view of a winder illustrating the principles of the present invention; and

FIGURE 2 is a diagrammatic view in side elevation of the winder shown in FIGURE 1.

In the illustrative form of the invention diagrammatically shown in the drawings, I have diagrammatically shown a drum winder for winding webs of paper and have described my invention in conjunction with such a winder, it being understood that the principles of the invention may be effectively utilized with winders for winding other materials, such as film and textiles.

A web of paper W coming from the paper machine is directed over two winding rolls 10, 10 which are both power driven in a suitable manner. The leading end of the web W is threaded around a tubular shell or core 11 on a winder shaft 12 and is suitably clamped to said core. The winder drums 10, 10 are then driven to rotate the winder shaft and shell so the roll of paper will build up on said shell in contact with the winder drums 10, 10. As the roll builds up on the shell 11 and winder shaft 12, the winder shaft will ride upwardly in alignment with the U nip between the winder drums 10, lifting bearing boxes 13, 13 for said shaft along vertical guides 15, 15 having slidable guiding engagement with opposite sides of said bearing boxes.

The construction of the winder up to this point is conventional and may be constructed in any desired conventional manner.

A means is provided to lift the bearing boxes 13, 13 along the guides 15, 15 and to thereby relieve the weight of the paper built up on the shell 11 and winder shaft 12, which may be of any conventional form and is herein shown as being fluid pressure cylinders 16, 16 having the piston rods 17, 17 extensible therefrom and having operative engagement with the bearing boxes 13, 13. The cylinders 16, 16 may be supplied with fluid under pres- I sure at progressively increasing pressures, to increase the relieving pressure on the shaft 12 as the roll builds up.

A means is provided to apply a bending moment to the outer ends of the shaft 12 in a direction opposite to the bending moment applied to the shaft by lifting the shaft by the fluid pressure operated cylinders 16 and piston rods 17 to cause the shaft to assume a generally S-shaped deflection curve approaching a straight line and to therefore give a more uniform relieving of the weight of the roll of paper from the winder drums 10, 10. This means is diagrammatically shown as comprising a pair of laterally spaced bending cylinders 19, 19 suitably supported above the opposite end portions of the shaft 12 and having piston rods 20, 20 extensible therefrom and engageable with bearing boxes 21, 21 journalled on the ends of the shaft 12.

Asthe roll builds up on the core 11 and winder shaft 12, the piston rods 17, 17 will lift the bearing boxes 13, 13 along the guides 15, 15 and the bearing boxes 21, 21 will come into engagement with the piston rods 20, 20. The pressure of fluid, such as air in the cylinders 19, 19 will tend to move the bearing boxes 21, 21 downwardly and to place bending moments on the shaft 12 in an opposite direction to the bending moments placed on said shaft by the cylinders 16, 16 and piston rods 17, 17. The moments created on the shaft 12 by the cylinders 16, 16, relieving the shaft of the weight of the roll of paper are thus counteracted by the moments created by the bending cylinders 19, 19 which in addition to exerting bending moments on opposite ends of the shaft counteract the tendency for the shaft to bind the bearing boxes in the guides 15 by the bending thereof by the lifting cylinders 16, 16 and thus allow the bearing boxes 13, 13 to freely move along the guides 15, 15.

As has previously been mentioned, the relieving of weight of the roll building up on the winder drums 10, 10 from the shaft 12 is progressive and the relieving pressure increases as the roll builds up. The pressure in the bending cylinders 19, 19 is also progressive and this pressure must increase as the roll builds up. The pressures to the relieving cylinders 16, 16 and bending cylinders 19, 19 may be controlled by a suitable pressure regulator (not shown) which senses the roll diameter and increases the pressure to the relieving cylinders 16, 16 and the bending cylinders 19, 19 as a straight line function of diameter.

It is, of course, obvious that the cylinders that produce the relieving also produce the reaction to the bending cylinder forces, so that the bending forces do not add to the nip and the relieving cylinders produce relieving forces equal to the total force output of the relieving cylinders minus the bending cylinder forces.

It should also be understood that while the system may be operated by the same air pressure going to both the bending cylinders 19, 19 and the relieving cylinders 16, 16 that the ratio of pressures in the two sets of cylinders may be changed using conventional ratio totalizers to enable the amount of bending to be adjusted consistent with the amount of relieving.

It may be seen from the foregoing that by the principles of the present invention a uniformly wound relatively soft roll of paper may be attained and that this is attained by counteracting the deflection of the winder shaft by the lifting cylinders, which of themselves cause the shaft to assume a U-shaped deflection, by providing a cantilever bending action on the opposite end portions of the shaft exerting a counteraction on the winder shaft to assume an S-shaped deflection curve and more nearly approach a straight line, with a resultant uniform relief of the weight of the roll of paper from the winder drums and a resultant uniform density of the roll.

While I have herein shown and described one form in which the invention may be embodied, it may readily be understood that various variations and modifications in the invention may be attained without departing from the spirit and scope of the novel concepts thereof.

I claim as my invention:

1. In a drum winder for winding webs of paper and the like into large diameter rolls, a winder shaft, at least one power driven drum adapted to support and wind the roll of paper on said shaft, vertical guide means for opposite ends of said shaft, means exerting progressively increasing upward lifting forces on opposite ends of said shaft to relieve the nip pressures between the roll of paper and said winding drum, and thereby exerting a deflecting force on said shaft about its transverse center, and other means exerting progressively increasing bending forces on opposite ends of said shaft in a direction opposite of the direction of the lifting forces thereon, and thereby equalizing deflection of said shaft about its transverse center and relieving binding in said guide means resulting from said upward lifting forces.

2. In a drum winder for webs of paper and the like, a power driven horizontally extending winder drum, a horizontal winder shaft, said drum being adapted to support a roll of paper to be wound on said shaft by rotatable movement thereof, vertical rectilinear guide means for opposite ends of said shaft, guiding said shaft for upward movement as the roll of paper increases in diameter, fluid pressure cylinder and piston means adjacent each end of said shaft exerting upward lifting forces on opposite ends of said shaft during winding of the roll, and other fluid pressure cylinder and piston means spaced outwardly of said first mentioned fluid pressure cylinder and piston means for exerting opposite bending forces on opposite ends of said shaft thereby relieving binding in said guide means resulting from said upward lifting forces.

3. In a drum winder for winding webs of paper and the like into rolls, a horizontal winder shaft, a pair of winder drums on opposite sides of said shaft and adapted to support and wind the web about said shaft into the form of a roll, rectilinear guide means for opposite ends of said shaft guiding said shaft for upward movement with respect to said winder drums as a roll of paper is built up thereon, and means assuring uniformity in winding of the paper on said shaft and attaining a relatively soft roll comprising fluid pressure cylinder and piston means exerting upward lifting forces on opposite ends of said shaft during winding of the roll and in vertical alignment with said guide means, and other fluid pressure cylinder and piston means exerting downward bending forces on opposite ends of said shaft outwardly of said first mentioned cylinder and piston means thereby relieving binding in said guide means resulting from said upward lifting forces.

4. In a drum winder for winding webs of paper and the like into rolls, a horizontal winder shaft, a pair of winder drums on opposite sides of said shaft and adapted to support and wind the web about said shaft into the form of a roll, spaced rectilinear vertical guides adjacent opposite ends of said shaft, bearings for said shaft guided for movement along said guides, and moving upwardly along said guides as a roll of paper is built up on-said shaft, fluid pressure cylinder and piston means exerting upward lifting movement on said bearings, and other References Cited by the Examiner fluid pressure cylinder and piston means exerting down- UNITED STATES PATENTS ward bending forces on opposite ends of said shaft out- 2,327,832 8/1943 Vogel 242-6S wardly of said first mentioned cylinder and piston means 5 2,601,876 7/1952 CanuR 242 '65 X d th b the u ward f c 2,611,150 9/1952 Gouldlng 100162 an Y 16mg P 1 mg es on 2,804,275 8/1957 Saco et a1 242-753 shaft and Weight of the roll of paper thereon and relieving 2 325 217 3 /1953 Byrd 10 1 2 binding between said bearings and the vertical guide FOREIGN PATENTS means resulting from said upward lifting forces to attain 10 747,347 4/1956 Great Britain. a relatively soft roll of uniform density. MERVIN STEIN, Primary Examiner. 

1. IN A DRUM WINDER FOR WINDING WEBS OF PAPER AND THE LIKE INTO LARGE DIAMETER ROLLS, A WINDER SHAFT, AT LEAST ONE POWER ON SAID SHAFT, VERTICAL GUIDE MEANS FOR OPPOSITE OF PAPER ON SAID SHAFT, VERTICAL GUIDE MEANS FOR OPPOSITE ENDS OF SAID SHAFT, MEANS EXERTING PROGRESSIVELY INCREASING UPWARD LIFTING FORCES ON OPPOSITE ENDS OF SAID SHAFT TO RELIEVE THE NIP PRESSURES BETWEEN THE ROLL OF PAPER AND SAID WINDING DRUM, AND THEREBY EXERTING A DEFLECTING FORCE ON SAID SHAFT ABOUT ITS TRANSVERSE CENTER, AND OTHER MEANS EXERTING PROGRESSIVELY INCREASING BENDING FORCES ON OPPOSITE ENDS OF SAID SHAFT IN A DIRECTION OPPOSITE OF THE DIRECTION OF THE LIFTING FORCES THEREON, AND THEREBY EQUALIZING DEFLECTION OF SAID SHAFT ABOUT ITS TRANSVERSE CENTER AND RELIEVING BINDING IN SAID GUIDE MEANS RESULTING FROM SAID UPWARD LIFTING FORCES. 